@keyframes myanimation{
    0% {left: -500px;}
    100% {left: 0px;}
}

@keyframes color{
    0% {}
    50% {color: #f8f8f8;}
    100% {}
}




.introduction{
    position: relative;
    animation-name: myanimation;
    animation-duration: 2s;
    animation-timing-function: ease-in-out;
}

.container .btn{
    position: relative;
    animation-name: myanimation;
    animation-duration: 2s;
    animation-timing-function: ease-in-out;
}